Blue triazol dye and process of making same.



UNITED STATES PATENT OFFICE.

JULIUS HERBABNY, OF OFFENBAOH-ON-THE-MAIN, GERMANY, ASSIGNOR TO FIRM OF K. OEHLER, ANILIN- & ANILINFARBEN-FABRIK, OF SAME PLACE.

BLUE TRIAZOL DYE AND PROCESS OF MAKING SAME.

SPECIFICATION formingpart of Letters Patent No. 670,398, dated March 19, 1901.

Application filed February 6 1900. h ri l No- L226- (Specimens-l To all whom, it 111/11, concern:

Be it known that I, JULIUS HERBABNY, chemist, doctor of philosophy, residing at Biebererstrasse 32,0ffenbach-on-the-Main,in the Grand Duchy of Hesse, Germany, have invented new and useful Improvements in Blue Triazol Dyes, of which the following is a specification.

In the German Patent No. 107,498 a process is described for the transformation of the coloring-matter sulfanilic acid-azo-amido'R-salt into a triazol trisulfonic acid which may be converted into a dioxy triazol mono sulfonic acid of the formula:

SO H SO H by melting it during five hours with the triple quantity of sodium lye of sixty per cent. at 230 centigrade. This acid, combinedwith diazo compounds, yields valuable coloringmatters. By the action of the tetrazo compounds of para-diami'ns upon the dioxy triazol mono sulfonic acid either so-called intermediate products or tetrazo dyestuffs will be obtained, according to the molecular proportions used. The dioxy triazol mono sulfonic acid may also easily be combined with those intermediate products which are formed from the tetrazo compounds of para-diamins and amine, phenols, amidophenols, their sulfonic or carboxylic acids, thus yielding tetrazo dyestuffs. A valuable coloring-matter of this series results when the intermediate product obtained in an alkaline solution from one Prepare in the usual way an intermediate product in soda alkaline solution from 21.2 parts of tolidin (or the equimolecular proportion of benzidin or dianisidin) and 34.1 parts of 1.S-amidonaphthol-b.-6-disulfonic acid, and then add a solution of thirty-eight parts of dioxy triazol mono sulfonic acid. The formation of the dyestuff begins at once and is finished after twelve hours. Then heat the whole to 80 centigrade, precipitate with common salt, filter, press, and dry. The resulting dyestuff is practically insoluble in alcohol, but easily dissolving in water to a blue solution which turns slightly red on adding soda-lye and from which a bluish-violet precipitate separates on adding hydrochloric acid, also dissolving in concentrated sulfuric acid to a pure-blue solution which falls down on adding waterand dyeing unmordanted cotton a blue fast to Washing. The same product is obtained by conjugating the tetrazo compound of the para diamin first with the dioxy triazol mono sulfonic acid and then combining the thus formed intermediate product with the 1.8-amidonaphthol-3.6-disulfonic acid.

Now, what I claim, and desire to secure by Letters Patent, is the following:

1. As a new process the manufacture of blue tetrazo dyes of the general formula Amido-naphthol-sulfonic acid Para diamin Di-oxy-triazol-sulfonic acid,

consisting in the combination of an intermediate product from a para diamin and oneon (s o H .on -N:NG H NH 1 6 3 3 soin as) o,H,.oI-I,-N=N-o,,H/ 2

u -o rnLso n,

deriving from one molecule of tolidin, one

molecule of 1: S-amido-naphthol, 3:6-disulprecipitate falls down on adding Water, and fonic acid and one molecule of di-OXy-tridyeingunmordanted cotton pure-blue shades azol-mono-sulfonic acid, which is in its dry fast to washing.

state a brown-black powder with a metallic In testimony whereof I have signed my 15 5 luster, practically insoluble in alcohol but name to this specification in the presence of easily dissolving in water to a blue solution tWo subscribing Witnesses. which turns slightly red on adding soda-lye w 7 T and from which a bluish-violet precipitate JULIUS HLRLALNX' separates on adding hydrochloric acid, also Witnesses:

I0 dissolving in concentrated sulfuric acid to a RICHARD GUENTHER,

pure-blue solution from which a bluish-violet CARL GRUND. 

